"Are there two pints in a quart or four?" asked a customer at a bar.

"There are two pints in a quart," confirmed the owner of the bar.

The customer then moved back along the bar, and soon the barmaid asked for his order.

"Two pints please, Miss, and they are on the house," said the customer.

The barmaid doubted that her boss would be so generous, so the fellow called out to the owner at the other end of the bar, "You did say two pints, didn't you?"

"That's right," barked the owner, "two pints!"